Alarm-clock.



W. J. LARKIN.

ALARM GLOGK.

APPLICATION FILED AUG. 10, 1910.

977,199. Patented Nov. 29, 1910.

"UNITED STAZIESQIZEENT onnron.

WILLIAM J. LARKIN, OF VVATERBURY, CONNECTICUT, ASSIGNOR TO "WATERBURY CLOCK CO., OF 'WATERBURY, CONNECTICUT, A CORPORATION.

ALARM-CLOCK.

Application filed August 10,

T all whom it may concern:

Be it known that I, VVILLIAM J. LARKIN, a citizen of the United States, residing at Va terbury, in the county of New Haven and State of Connecticut, have invented a new and useful In'iprovement in Alarm-Clocks; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specilication, and represent, in-

Figure 1 a plan View of a clock provided with my improved switch with the bell re moved and the hammer-wire shown in section. Fig. 2 an enlarged broken view thereof in vertical section on the line al) of Fig. 1 showing the engagement of the stop-finger of the switch with one of the side walls of the clearance-opening in the case. Fig. 3 a view in vertical section on the line c-cZ of Fig. 1 on the same scale as Fig. 2 and showing the friction-washer provided for the alarm-switch. Fig. 4 a detached view in side elevation of the switch. Fig. 5 a plan view thereof.

My invention relates to an improvement in switches for that class of so called nickel alarm clocks in which the bell is supported in a horizontal position centrally above the clock-case upon a vertical post fastened at its lower end thereto, the object being to provide a simple, convenient and effective alarmswitch constructed with particular reference to holding its position and to being prevented from swinging too far in either direction and so endangering the bending of the hammer-wire which throws the hammer-head out of ri 'ht relation to the bell.

lVith these ends in view my invention consists in a switch for nickel-alarm clocks having certain details of construction and combinations of parts as will be hereinafter described and pointed out in the claims.

In carrying out my invention as herein shown, my alarm-switch is struck out from a single piece of metal and comprises a washer-like hub 2, an operating arm 3, an alarm-stop arm 1 and a safety stop 5 which latter extends downward into a clearanceopening 6 formed in the cylindrical sheetmetal case 7 a little to the right of the vertical center thereof for the upward passage and clearance of the hammer-wire 8 carry- Specification of Letters Patent.

Patented Nov. 29, 1910. 1910. Serial No. 578,507.

ing the hammer-head 9 which strikes the bell'lO. The washer-like hub 2 is struck up so as to form a spring and formed, as shown, with a central opening for the passage through it of a rivet 11 formed at the lower end of the bell-post 12, the said rivet also passing through washers 13 and 14 placed upon the upper and lower face of the case 7 so as to be concentric with the rivet-hole 15 formed therein for the downward passage through the case of the rivet 11 the lower end of which is upset as at 16 for securing the post in place. Under this construction, the alarm-switch is rotatable upon the rivet 11 against the spring tension of its hub 2 within the limits of the safety-stop 5 which engages with the wall of the opening 6 at opposite points thereof so as to limit the swinging movement of the switch in one direction or the other and thus prevent the alarm-stop arm 4 of the switch from bending the hammer-wire 8 and thus endangering the predetermined position of the hammer-head 9 with respect to the bell 10. When the arm 3 of the switch is swung from right to left, the arm 4 thereof clears the hammer-wirev 8 and permits the vibration thereof and the sounding of the alarm. On the other hand, when the arm 3 is swung from left to right to the limit of its movement, the arm t is crowded against the ham mer-wire 8 so as to block the vibration thereof. At the upper end of the post 12, it is formed with a threaded stem 17 which passes through the bell 10 and receives the threaded head 18 of the bail or ring 19 forming a handle for the clock. If desired, the bellpost 12 may be secured by its lower end to the top of the clock-case by a screw entering its lower end from the inside of the case. Such a screw would then take the place of the rivet 11. The use of a screw as described is thought to be too obvious to require any illustration.

I claim 1. In an alarm clock, the combination with a cylindrical sheet-metal case, of a vertical bell-post fastened at its lower end in the top of the said case, a bell mounted upon the upper end of the said post, a hammer wire and hammer-head, the former extending up ward into the bell through a clearance-opening formed in the case, and a sheet-metal alarm-switch pivotally mounted upon the said bell-post and comprising an operatingarm, an alarm stop-arm coacting with the said hammer-wire, and a safety stop which extends downward into the said clearanceopening and engages with opposite points on the wall thereof to limit the swinging movement of the switch and thus prevent the bending of the hammer-wire by the alarm stop-arm of the switch.

2. In an alarm clock, the combination with a cylindrical sheet-metal case formed in its upper portion with a clearance-opening, of a hammer-wire extending upward through the said opening and carrying a hammerhead, a vertical bellpost fastened at its lower end in the top or the said case, a bell mounted upon the upper end of the said bell-post, and a sheet-metal alarm-switch formed with a struck-up washer-like hub having a central opening receiving the lower end of the said post which passes downward through the said struck up hub and through the top of the said case to which it is secured and the said switch being also formed with an operating-arm whereby it is swung upon the said post, with an alarm-stop arm coacting with the said ha1nn1erwire and with a safety-stop co-acting with opposite points on the wall of the said opening to prevent the said alarm stop-arm from bending the hammer-wire.

In testimony whereof I have signed this specification in the presence of two subscrili)- ing witnesses.

\VILLIAM J. LARKIN.

\Vitnesses G. 1. Games, C. V. SHADER. 

